Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a1d00e44ae3179…

MALICIOUS

PDF

68.5 KB Created: 2021-03-16 00:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b6c041e37f1debacaae3cc44df285ab SHA-1: 781fbd50f5da1c91498df519791bc20fb86e7268 SHA-256: 40a1d00e44ae31791816f54135c49666a626d79a29ca5c31feb3289614d0ec48
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to multiple PDF files. The document body, though heavily obfuscated, suggests a lure related to 'New bollywood song wapking.cc'. The presence of embedded URIs and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/123?utm_term=new+bollywood+song++wapking.+cc
    • http://damvglaz1.xyz/maxinupetexlt9ok.pdf
    • http://afracheat8.xyz/48584396921epuch.pdf
    • https://cdn.sqhk.co/nimuxugemu/4gd96hd/fish_eat_fish_3_player.pdf
    • https://cdn.sqhk.co/sadebupunen/jijhPib/download_ringtone_message_samsung_s9.pdf
    • https://cdn.sqhk.co/dowivita/1hbBaha/21193145340.pdf
    • http://workbykoder.xyz/34019853187tqgne.pdf
    • http://floradoma.net/how_to_determine_how_many_calories_your_dog_needszjmse.pdf
    • https://cdn.sqhk.co/revinoxu/cswxggs/visofererufas.pdf
    • https://cdn.sqhk.co/movijomo/gc2jigf/lemon_bread_recipe_with_cake_mix_and_pudding.pdf
    • http://missunik.space/mammography_screening_guidelineskf736.pdf
    • http://purpless.vip/46437791279z0w3b.pdf
    • http://setlyb.online/34566237885yomdr.pdf
    • http://pinerapidsrr.com/39962341671cdrpb.pdf
    • http://magnifioco.site/33164367627bomv7.pdf
    • https://cdn.sqhk.co/rufigukuj/R4ZPCNO/wexivovuwavipefa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_53e84e58458845fda06af5e131836e7c.pdf?index=true
    • https://s3.amazonaws.com/miwolezedubujoz/bima_howala_palu_kanda_dj_song.pdf
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_fe75fa35c2004b0987dc439adcd6dd2c.pdf?index=true
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_61e2488bc1b343bf916790c1c2ae2215.pdf?index=true
    • https://s3.amazonaws.com/fuvidokibet/xudawowibokifa.pdf
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_9846e7eeaac4403aaac7a7663d9895c6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce46.bin
7e79e08f57727510d4b38a1fd3122d62ae770ebfa4e5659d1cc976e3f0eab716
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE46 5544 bytes
font_01_sfnt_off0000e162.bin
c8e468279007fbed6c09fe30e86b3afcd4ba9ecad977c0366ab1a004964f751e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 10204 bytes